/* ============================================================
   51 - 汽车改装与视频社区 | rzhqLuqL.cn
   主样式文件 v1.0
   ============================================================ */

/* ---- 全局变量与重置 ---- */
:root {
  --primary: #0a1628;
  --secondary: #1a2e50;
  --accent: #e85d04;
  --accent2: #1565c0;
  --gold: #f4a821;
  --text: #e8eaf6;
  --text-muted: #90a4ae;
  --card-bg: #0d1f3c;
  --border: rgba(255,255,255,0.08);
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-main: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-main);
  background: var(--primary);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--gold); }

img { max-width: 100%; height: auto; display: block; }

ul, ol { list-style: none; }

/* ---- 干扰标签样式（不影响布局） ---- */
.noise-hidden {
  display: none !important;
  visibility: hidden !important;
  position: absolute !important;
  width: 0 !important;
  height: 0 !important;
  overflow: hidden !important;
  pointer-events: none !important;
}

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: linear-gradient(90deg, var(--accent2) 0%, var(--accent) 100%);
  padding: 6px 0;
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
}

.top-bar a { color: #fff; }
.top-bar a:hover { color: var(--gold); }

/* ---- 导航栏 ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10,22,40,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.site-logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 8px;
}

.logo-text {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  letter-spacing: 1px;
  white-space: nowrap;
}

.logo-text span { color: var(--accent); }

/* 主导航 */
.main-nav { flex: 1; }

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav ul li a {
  display: block;
  padding: 8px 14px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  border-radius: 8px;
  transition: var(--transition);
  white-space: nowrap;
}

.main-nav ul li a:hover,
.main-nav ul li a.active {
  color: #fff;
  background: rgba(232,93,4,0.15);
}

/* 搜索框 */
.header-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 6px 14px;
  gap: 8px;
  min-width: 200px;
  transition: var(--transition);
}

.header-search:focus-within {
  border-color: var(--accent);
  background: rgba(232,93,4,0.08);
}

.header-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 14px;
  width: 100%;
  font-family: var(--font-main);
}

.header-search input::placeholder { color: var(--text-muted); }

.header-search button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0;
  display: flex;
  align-items: center;
  transition: var(--transition);
}

.header-search button:hover { color: var(--accent); }

/* 汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- 搜索栏（导航下方） ---- */
.search-bar-section {
  background: var(--secondary);
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-bar-big {
  flex: 1;
  display: flex;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  max-width: 700px;
}

.search-bar-big input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 10px 16px;
  color: var(--text);
  font-size: 15px;
  font-family: var(--font-main);
}

.search-bar-big input::placeholder { color: var(--text-muted); }

.search-bar-big button {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 10px 20px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-main);
  transition: var(--transition);
  white-space: nowrap;
}

.search-bar-big button:hover { background: #c44d00; }

.search-hot-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-muted);
}

.search-hot-tags a {
  color: var(--text-muted);
  background: rgba(255,255,255,0.05);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  transition: var(--transition);
}

.search-hot-tags a:hover {
  color: var(--accent);
  background: rgba(232,93,4,0.1);
}

/* ---- 布局容器 ---- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 12px 0;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 6px; }

/* ---- 区块标题 ---- */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--gold));
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1.3;
}

.section-title .brand { color: var(--accent); }

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ---- Hero 横幅 ---- */
.hero-section {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  filter: brightness(0.4);
  transform: scale(1.05);
  transition: transform 8s ease;
}

.hero-section:hover .hero-bg { transform: scale(1.0); }

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,22,40,0.9) 0%, rgba(232,93,4,0.15) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(232,93,4,0.2);
  border: 1px solid rgba(232,93,4,0.4);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 900;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-title .accent { color: var(--accent); }
.hero-title .gold { color: var(--gold); }

.hero-desc {
  font-size: 18px;
  color: rgba(255,255,255,0.75);
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent), #c44d00);
  color: #fff;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(232,93,4,0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(232,93,4,0.5);
  color: #fff;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: #fff;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  border: 2px solid rgba(255,255,255,0.3);
  cursor: pointer;
  transition: var(--transition);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(232,93,4,0.08);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.hero-stat-item { text-align: center; }

.hero-stat-num {
  font-size: 32px;
  font-weight: 900;
  color: var(--accent);
  display: block;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-muted);
}

/* ---- 视频卡片 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.video-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(232,93,4,0.3);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #0a1628;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.video-card:hover .video-thumb img { transform: scale(1.06); }

.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}

.video-card:hover .video-play-btn { opacity: 1; }

.play-icon {
  width: 60px;
  height: 60px;
  background: rgba(232,93,4,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(232,93,4,0.5);
}

.video-card:hover .play-icon { transform: scale(1); }

.play-icon svg {
  width: 24px;
  height: 24px;
  fill: #fff;
  margin-left: 3px;
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 700;
}

.video-info {
  padding: 14px;
}

.video-title {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
}

.video-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ---- 通用卡片 ---- */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(232,93,4,0.25);
}

.card-img {
  aspect-ratio: 4/3;
  overflow: hidden;
}

.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card:hover .card-img img { transform: scale(1.05); }

.card-body { padding: 20px; }

.card-tag {
  display: inline-block;
  background: rgba(232,93,4,0.15);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.card-title {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  line-height: 1.5;
}

.card-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- 专家卡片 ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.expert-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}

.expert-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(232,93,4,0.3);
}

.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--accent);
}

.expert-name {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 4px;
}

.expert-role {
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
}

.expert-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.expert-awards {
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.award-badge {
  background: rgba(244,168,33,0.15);
  color: var(--gold);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.expert-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 12px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-sm-primary {
  background: var(--accent);
  color: #fff;
}

.btn-sm-primary:hover { background: #c44d00; color: #fff; }

.btn-sm-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-sm-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---- 合作品牌 Logo 墙 ---- */
.partner-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}

.partner-logo {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}

.partner-logo:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  transition: var(--transition);
  gap: 12px;
}

.faq-question:hover { color: var(--accent); }

.faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  background: rgba(232,93,4,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 16px;
  font-weight: 700;
  transition: var(--transition);
}

.faq-item.active .faq-icon { transform: rotate(45deg); background: var(--accent); color: #fff; }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 20px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 20px 18px;
}

/* ---- 用户评论 ---- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(232,93,4,0.2);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}

.review-user-info { flex: 1; }

.review-name {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}

.review-date {
  font-size: 12px;
  color: var(--text-muted);
}

.review-stars {
  color: var(--gold);
  font-size: 14px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 12px;
}

.review-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.review-tag {
  background: rgba(255,255,255,0.05);
  color: var(--text-muted);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
}

/* ---- 联系我们 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(232,93,4,0.3);
}

.contact-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 26px;
}

.contact-title {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.contact-info {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- 社交分享 ---- */
.share-section {
  background: var(--secondary);
  padding: 40px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.share-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.share-text {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
}

.share-buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  color: #fff;
}

.share-btn:hover { transform: translateY(-2px); opacity: 0.9; color: #fff; }

.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #010101; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; }

/* ---- 页脚 ---- */
.site-footer {
  background: #060e1c;
  padding: 60px 0 0;
  border-top: 1px solid var(--border);
}

.footer-grid {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand .logo-text {
  font-size: 24px;
  margin-bottom: 12px;
  display: block;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}

.footer-qr {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.qr-item { text-align: center; }

.qr-item img {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  border: 2px solid var(--border);
}

.qr-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.footer-bottom {
  max-width: 1280px;
  margin: 40px auto 0;
  padding: 20px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-copy a { color: var(--text-muted); }
.footer-copy a:hover { color: var(--accent); }

.footer-update {
  font-size: 12px;
  color: var(--text-muted);
}

/* ---- 区块间距 ---- */
.section { padding: 72px 0; }
.section-sm { padding: 48px 0; }
.section-lg { padding: 96px 0; }

.section-dark { background: var(--secondary); }
.section-alt { background: rgba(255,255,255,0.02); }

/* ---- 数据统计条 ---- */
.stats-bar {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  padding: 32px 0;
}

.stats-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-item { text-align: center; }

.stat-num {
  font-size: 36px;
  font-weight: 900;
  color: #fff;
  display: block;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.8);
}

/* ---- AI 赋能区块 ---- */
.ai-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.ai-feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.ai-feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  transform: scaleX(0);
  transition: var(--transition);
}

.ai-feature-card:hover::before { transform: scaleX(1); }

.ai-feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.ai-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.ai-title {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.ai-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ---- How-To 加入社区 ---- */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px;
  counter-reset: step;
}

.howto-step {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  position: relative;
  transition: var(--transition);
}

.howto-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(232,93,4,0.3);
}

.step-num {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  color: #fff;
  margin: 0 auto 16px;
}

.step-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-feature-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .header-inner { height: 60px; }
  .main-nav { display: none; }
  .main-nav.open { display: block; position: absolute; top: 60px; left: 0; right: 0; background: var(--primary); border-bottom: 1px solid var(--border); padding: 16px; }
  .main-nav.open ul { flex-direction: column; }
  .nav-toggle { display: flex; }
  .header-search { display: none; }
  .hero-section { min-height: 480px; }
  .hero-title { font-size: 28px; }
  .section-title { font-size: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .ai-feature-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .share-inner { flex-direction: column; text-align: center; }
  .search-hot-tags { display: none; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-content { padding: 60px 16px; }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-outline { justify-content: center; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
}

/* ---- 懒加载占位 ---- */
img[data-src] {
  background: linear-gradient(135deg, var(--secondary), var(--card-bg));
  min-height: 100px;
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gold); }

/* ---- 选中文字颜色 ---- */
::selection { background: rgba(232,93,4,0.3); color: #fff; }

/* ---- 加载动画 ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in-up { animation: fadeInUp 0.6s ease forwards; }

/* ---- 标签云 ---- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-item {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 13px;
  transition: var(--transition);
  cursor: pointer;
}

.tag-item:hover {
  background: rgba(232,93,4,0.1);
  border-color: var(--accent);
  color: var(--accent);
}

/* ---- 视频模态框 ---- */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.9);
  align-items: center;
  justify-content: center;
}

.video-modal.active { display: flex; }

.video-modal-inner {
  position: relative;
  width: 90%;
  max-width: 900px;
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
}

.video-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(0,0,0,0.7);
  border: none;
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: var(--transition);
}

.video-modal-close:hover { background: var(--accent); }

.video-modal video {
  width: 100%;
  aspect-ratio: 16/9;
  display: block;
}

/* ---- 通知栏 ---- */
.notice-bar {
  background: rgba(232,93,4,0.1);
  border: 1px solid rgba(232,93,4,0.2);
  border-radius: 8px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.notice-bar .notice-icon { color: var(--accent); font-size: 16px; }

/* ---- 分类标签栏 ---- */
.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.category-tab {
  padding: 8px 18px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  transition: var(--transition);
  font-family: var(--font-main);
}

.category-tab:hover,
.category-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ---- 分页 ---- */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.page-btn {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-family: var(--font-main);
}

.page-btn:hover,
.page-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}